rfc1116.txt
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TXT
1,179 行
SPC0 Initial setting for a special character
SPC1 A changed special character < SPC0
SPC-A All current special character settings
VAL SLC_VALUE level
DEF SLC_DEFAULT level
Telnet Linemode Working Group [Page 16]
RFC 1116 Telnet Linemode Option August 1989
Levels: DEFAULT, VALUE, CANT_CHANGE, NOSUPPORT
Flags: ACK
Receive Response
------- --------
f,SLC_DEFAULT,x f,SLC_VALUE,v
f,SLC_CANTCHANGE,v
f,SLC_NOSUPPORT,x
f,SLC_VALUE,v f,SLC_ACK|SLC_VALUE,v
f,SLC_CANTCHANGE,w
f,SLC_NOSUPPORT,x
f,SLC_CANTCHANGE,v f,SLC_ACK|SLC_CANTCHANGE,v
f,SLC_NOSUPPORT,x
f,SLC_NOSUPPORT,x f,SLC_ACK|SLC_NOSUPPORT,x
x,SLC_ACK|x,x no response
5.10 Examples of a connection
In these examples, the symbolic names are used rather than the actual
values, to make them readable. When two or more symbolic names are
joined by a |, it means that the actual value will be the logical
"or" of the values of the symbolic names. In the interest of
clarity, for these examples the leading IAC and IAC SB sequences, and
the trailing IAC SE sequences have been omitted. Also, the SLC_
prefix has been left off where ever it would normally occur.
CLIENT SERVER
------ ------
DO TOGGLE-FLOW-CONTROL
DO LINEMODE
WILL TOGGLE-FLOW-CONTROL
WILL LINEMODE
[ Subnegotiation may now proceed in both directions. The client
sends of the list of special characters. ]
LINEMODE SLC SYNCH DEFAULT 0
IP VALUE|FLUSHIN|FLUSHOUT 3 AO
VALUE 15 AYT DEFAULT 0 ABORT
VALUE|FLUSHIN|FLUSHOUT 28 EOF
VALUE 4 SUSP VALUE|FLUSHIN 26
EC VALUE 127 EL VALUE 21 EW
VALUE 23 RP VALUE 18 LNEXT
VALUE 22 XON VALUE 17 XOFF
VALUE 19
[ Now that linemode is enabled, the server sets the initial
Telnet Linemode Working Group [Page 17]
RFC 1116 Telnet Linemode Option August 1989
mode, and acknowledges the special characters. ]
LINEMODE MODE EDIT
LINEMODE SLC SYNCH NOSUPPORT 0 IP
VALUE|FLUSHIN|FLUSHOUT|ACK 3 AO
NOSUPPORT 0 AYT NOSUPPORT 0 ABORT
VALUE|FLUSHIN|FLUSHOUT|ACK 28 EOF
VALUE|ACK 4 SUSP NOSUPPORT 0 EC
VALUE|ACK 127 EL VALUE|ACK 21 EW
VALUE|ACK 23 RP VALUE|ACK 18 LNEXT
VALUE|ACK 22 XON VALUE|ACK 17 XOFF
VALUE|ACK 19
[ The client gets the mode and ack of the special characters,
and acks the mode and any special characters that the server
changed. ]
LINEMODE MODE EDIT|MODE_ACK
LINEMODE SLC SYNCH
NOSUPPORT|ACK 0 AO
NOSUPPORT|ACK 0 AYT|ACK NOSUP-
PORT 0 SUSP NOSUPPORT|ACK 0
"Login:"
"my_account"
[ Turn off echo to the user. ]
WILL ECHO
DO ECHO
"Password:"
"my_password"
[ Turn back on echo to the user. ]
WONT ECHO
DONT ECHO
[ User does some stuff, and then runs an application that wants
to use single character mode, doing its own echoing of
characters, but keep signal trapping on. ]
WILL ECHO
DO ECHO
LINEMODE MODE TRAPSIG
LINEMODE MODE TRAPSIG|MODE_ACK
[ Application finishes. ]
WONT ECHO
DONT ECHO
LINEMODE MODE EDIT|TRAPSIG
LINEMODE MODE
EDIT|TRAPSIG|MODE_ACK
[ Another application, that wants full control of everything. ]
WILL ECHO
DO ECHO
LINEMODE MODE 0
Telnet Linemode Working Group [Page 18]
RFC 1116 Telnet Linemode Option August 1989
LINEMODE MODE 0|MODE_ACK
[ Application finishes. ]
WONT ECHO
DONT ECHO
LINEMODE MODE EDIT|TRAPSIG
LINEMODE MODE
EDIT|TRAPSIG|MODE_ACK
[ The user changes his erase character to ^H. ]
LINEMODE SLC EC VALUE 8
LINEMODE SLC EC VALUE|ACK 8
[ The user decides to revert to all the original client side
special characters. ]
LINEMODE SLC SYNCH DEFAULT 0
IP VALUE|FLUSHIN|FLUSHOUT 3 AO
VALUE 15 AYT DEFAULT 0 ABORT
VALUE|FLUSHIN|FLUSHOUT 28 EOF
VALUE 4 SUSP VALUE|FLUSHIN 26
EC VALUE 127 EL VALUE 21 EW
VALUE 23 RP VALUE 18 LNEXT
VALUE 22 XON VALUE 17 XOFF
VALUE 19
LINEMODE SLC SYNCH NOSUPPORT 0 AO
NOSUPPORT 15 AYT NOSUPPORT 0 SUSP
NOSUPPORT|FLUSHIN 26 EC VALUE|ACK
127 EW VALUE|ACK 23 RP VALUE|ACK
18 LNEXT VALUE|ACK 22 XON
VALUE|ACK 17 XOFF VALUE|ACK 19
LINEMODE SLC SYNCH
NOSUPPORT|ACK 0 AO
NOSUPPORT|ACK 15 AYT
NOSUPPORT|ACK 0 SUSP
NOSUPPORT|ACK|FLUSHIN 26
[ The user decides to import the remote sides default special
characters. ]
LINEMODE SLC 0 DEFAULT 0
LINEMODE SLC IP
VALUE|FLUSHIN|FLUSHOUT 3 ABORT
VALUE|FLUSHIN|FLUSHOUT 28 EOF
VALUE 4 EC VALUE 127 EL VALUE 21
[ Since these are the same as the current local settings, no
response is generated. ]
[ This next example is what would happen if an editor was fired
up, that wanted to let the client side do the echoing and
buffering of characters, but did not want it to do any line
editing, and only forward the data when got a control
character. Note that we have preceded all the the 0377s in the
forward mask with an IAC. ]
LINEMODE MODE 0
Telnet Linemode Working Group [Page 19]
RFC 1116 Telnet Linemode Option August 1989
LINEMODE DO FORWARDMASK IAC 0377
IAC 0377 IAC 0377 IAC 0377 0 0 0 0
0 0 0 0 0 0 0 01
LINEMODE MODE 0
LINEMODE WILL FORWARDMASK
[ Application runs to completion, and then things are to be set
back to what they were before. ]
LINEMODE MODE EDIT|TRAPSIG
LINEMODE DONT FORWARDMASK
LINEMODE MODE EDIT|TRAPSIG
LINEMODE WONT FORWARDMASK
6. Other Telnet options and RFCs
The following is a list of RFCs for various Telnet options that
should be supported along with LINEMODE.
1. Postel, J. and J. Reynolds, "TELNET PROTOCOL SPECIFICATION", RFC
854, USC/Information Sciences Institute, May 1983.
2. Postel, J. and J. Reynolds, "TELNET OPTION SPECIFICATIONS", RFC
855, USC/Information Sciences Institute, May 1983.
3. Postel, J. and J. Reynolds, "TELNET BINARY TRANSMISSION", RFC
856, USC/Information Sciences Institute, May 1983.
4. Postel, J. and J. Reynolds, "TELNET ECHO OPTION", RFC 857,
USC/Information Sciences Institute, May 1983.
5. Postel, J. and J. Reynolds, "TELNET SUPRESS GO AHEAD OPTION", RFC
858, USC/Information Sciences Institute, May 1983.
6. Postel, J. and J. Reynolds, "TELNET TIMING MARK OPTION", RFC 860,
USC/Information Sciences Institute, May 1983.
7. VanBokkeln, J., "Telnet Terminal-Type Option", RFC 1091, FTP
Software, Inc., February 1989.
8. Waitzman, D., "Telnet Window Size Option", RFC 1073, BBN STC,
October 1988.
9. Hedrick, C., "Telnet Remote Flow Control Option", RFC 1080,
Rutgers University, November, 1988.
10. Hedrick, C., "Telnet Terminal Speed Option", RFC 1079, Rutgers
University, December, 1988.
The following is a list of RFCs that need not be supported for
Telnet Linemode Working Group [Page 20]
RFC 1116 Telnet Linemode Option August 1989
LINEMODE, but which would enhance any TELNET implementation.
11. Postel, J. and J. Reynolds, "TELNET STATUS OPTION", RFC 859,
USC/Information Sciences Institute, May 1983.
12. Postel, J. and J. Reynolds, "TELNET END OF RECORD OPTION", RFC
885, USC/Information Sciences Institute, December 1983.
13. Silverman, S., "OUTPUT MARKING TELNET OPTION", RFC 933, MITRE-
Washington, January 1985.
14. Marcy, G., "Telnet X Display Location Option", RFC 1096, Carnegie
Mellon University, March 1989.
Author's Address
Dave Borman
Cray Research Inc.
1440 Northland Drive
Mendota Heights, MN 55120
Phone: (612) 681-3398
EMail: dab@CRAY.COM
Telnet Linemode Working Group [Page 21]
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